cregit-Linux how code gets into the kernel

Release 4.10 drivers/parisc/eisa.c

Directory: drivers/parisc
/*
 * eisa.c - provide support for EISA adapters in PA-RISC machines
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 *
 * Copyright (c) 2001 Matthew Wilcox for Hewlett Packard
 * Copyright (c) 2001 Daniel Engstrom <5116@telia.com>
 *
 * There are two distinct EISA adapters.  Mongoose is found in machines
 * before the 712; then the Wax ASIC is used.  To complicate matters, the
 * Wax ASIC also includes a PS/2 and RS-232 controller, but those are
 * dealt with elsewhere; this file is concerned only with the EISA portions
 * of Wax.
 * 
 * 
 * HINT:
 * -----
 * To allow an ISA card to work properly in the EISA slot you need to
 * set an edge trigger level. This may be done on the palo command line 
 * by adding the kernel parameter "eisa_irq_edge=n,n2,[...]]", with 
 * n and n2 as the irq levels you want to use.
 * 
 * Example: "eisa_irq_edge=10,11" allows ISA cards to operate at 
 * irq levels 10 and 11.
 */

#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/spinlock.h>
#include <linux/eisa.h>

#include <asm/byteorder.h>
#include <asm/io.h>
#include <asm/hardware.h>
#include <asm/processor.h>
#include <asm/parisc-device.h>
#include <asm/delay.h>
#include <asm/eisa_bus.h>
#include <asm/eisa_eeprom.h>

#if 0
#define EISA_DBG(msg, arg... ) printk(KERN_DEBUG "eisa: " msg , ## arg )
#else

#define EISA_DBG(msg, arg... )  
#endif


#define SNAKES_EEPROM_BASE_ADDR 0xF0810400

#define MIRAGE_EEPROM_BASE_ADDR 0xF00C0400

static DEFINE_SPINLOCK(eisa_irq_lock);


void __iomem *eisa_eeprom_addr __read_mostly;

/* We can only have one EISA adapter in the system because neither
 * implementation can be flexed.
 */

static struct eisa_ba {
	
struct pci_hba_data	hba;
	
unsigned long eeprom_addr;
	
struct eisa_root_device root;
} 
eisa_dev;

/* Port ops */


static inline unsigned long eisa_permute(unsigned short port) { if (port & 0x300) { return 0xfc000000 | ((port & 0xfc00) >> 6) | ((port & 0x3f8) << 9) | (port & 7); } else { return 0xfc000000 | port; } }

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unsigned char eisa_in8(unsigned short port) { if (EISA_bus) return gsc_readb(eisa_permute(port)); return 0xff; }

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unsigned short eisa_in16(unsigned short port) { if (EISA_bus) return le16_to_cpu(gsc_readw(eisa_permute(port))); return 0xffff; }

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unsigned int eisa_in32(unsigned short port) { if (EISA_bus) return le32_to_cpu(gsc_readl(eisa_permute(port))); return 0xffffffff; }

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void eisa_out8(unsigned char data, unsigned short port) { if (EISA_bus) gsc_writeb(data, eisa_permute(port)); }

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void eisa_out16(unsigned short data, unsigned short port) { if (EISA_bus) gsc_writew(cpu_to_le16(data), eisa_permute(port)); }

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void eisa_out32(unsigned int data, unsigned short port) { if (EISA_bus) gsc_writel(cpu_to_le32(data), eisa_permute(port)); }

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#ifndef CONFIG_PCI /* We call these directly without PCI. See asm/io.h. */ EXPORT_SYMBOL(eisa_in8); EXPORT_SYMBOL(eisa_in16); EXPORT_SYMBOL(eisa_in32); EXPORT_SYMBOL(eisa_out8); EXPORT_SYMBOL(eisa_out16); EXPORT_SYMBOL(eisa_out32); #endif /* Interrupt handling */ /* cached interrupt mask registers */ static int master_mask; static int slave_mask; /* the trig level can be set with the * eisa_irq_edge=n,n,n commandline parameter * We should really read this from the EEPROM * in the furure. */ /* irq 13,8,2,1,0 must be edge */ static unsigned int eisa_irq_level __read_mostly; /* default to edge triggered */ /* called by free irq */
static void eisa_mask_irq(struct irq_data *d) { unsigned int irq = d->irq; unsigned long flags; EISA_DBG("disable irq %d\n", irq); /* just mask for now */ spin_lock_irqsave(&eisa_irq_lock, flags); if (irq & 8) { slave_mask |= (1 << (irq&7)); eisa_out8(slave_mask, 0xa1); } else { master_mask |= (1 << (irq&7)); eisa_out8(master_mask, 0x21); } spin_unlock_irqrestore(&eisa_irq_lock, flags); EISA_DBG("pic0 mask %02x\n", eisa_in8(0x21)); EISA_DBG("pic1 mask %02x\n", eisa_in8(0xa1)); }

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thomas gleixnerthomas gleixner119.48%125.00%
kyle mcmartinkyle mcmartin10.86%125.00%
Total116100.00%4100.00%

/* called by request irq */
static void eisa_unmask_irq(struct irq_data *d) { unsigned int irq = d->irq; unsigned long flags; EISA_DBG("enable irq %d\n", irq); spin_lock_irqsave(&eisa_irq_lock, flags); if (irq & 8) { slave_mask &= ~(1 << (irq&7)); eisa_out8(slave_mask, 0xa1); } else { master_mask &= ~(1 << (irq&7)); eisa_out8(master_mask, 0x21); } spin_unlock_irqrestore(&eisa_irq_lock, flags); EISA_DBG("pic0 mask %02x\n", eisa_in8(0x21)); EISA_DBG("pic1 mask %02x\n", eisa_in8(0xa1)); }

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kyle mcmartinkyle mcmartin10.85%125.00%
Total117100.00%4100.00%

static struct irq_chip eisa_interrupt_type = { .name = "EISA", .irq_unmask = eisa_unmask_irq, .irq_mask = eisa_mask_irq, };
static irqreturn_t eisa_irq(int wax_irq, void *intr_dev) { int irq = gsc_readb(0xfc01f000); /* EISA supports 16 irqs */ unsigned long flags; spin_lock_irqsave(&eisa_irq_lock, flags); /* read IRR command */ eisa_out8(0x0a, 0x20); eisa_out8(0x0a, 0xa0); EISA_DBG("irq IAR %02x 8259-1 irr %02x 8259-2 irr %02x\n", irq, eisa_in8(0x20), eisa_in8(0xa0)); /* read ISR command */ eisa_out8(0x0a, 0x20); eisa_out8(0x0a, 0xa0); EISA_DBG("irq 8259-1 isr %02x imr %02x 8259-2 isr %02x imr %02x\n", eisa_in8(0x20), eisa_in8(0x21), eisa_in8(0xa0), eisa_in8(0xa1)); irq &= 0xf; /* mask irq and write eoi */ if (irq & 8) { slave_mask |= (1 << (irq&7)); eisa_out8(slave_mask, 0xa1); eisa_out8(0x60 | (irq&7),0xa0);/* 'Specific EOI' to slave */ eisa_out8(0x62,0x20); /* 'Specific EOI' to master-IRQ2 */ } else { master_mask |= (1 << (irq&7)); eisa_out8(master_mask, 0x21); eisa_out8(0x60|irq,0x20); /* 'Specific EOI' to master */ } spin_unlock_irqrestore(&eisa_irq_lock, flags); generic_handle_irq(irq); spin_lock_irqsave(&eisa_irq_lock, flags); /* unmask */ if (irq & 8) { slave_mask &= ~(1 << (irq&7)); eisa_out8(slave_mask, 0xa1); } else { master_mask &= ~(1 << (irq&7)); eisa_out8(master_mask, 0x21); } spin_unlock_irqrestore(&eisa_irq_lock, flags); return IRQ_HANDLED; }

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static irqreturn_t dummy_irq2_handler(int _, void *dev) { printk(KERN_ALERT "eisa: uhh, irq2?\n"); return IRQ_HANDLED; }

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static struct irqaction irq2_action = { .handler = dummy_irq2_handler, .name = "cascade", };
static void init_eisa_pic(void) { unsigned long flags; spin_lock_irqsave(&eisa_irq_lock, flags); eisa_out8(0xff, 0x21); /* mask during init */ eisa_out8(0xff, 0xa1); /* mask during init */ /* master pic */ eisa_out8(0x11,0x20); /* ICW1 */ eisa_out8(0x00,0x21); /* ICW2 */ eisa_out8(0x04,0x21); /* ICW3 */ eisa_out8(0x01,0x21); /* ICW4 */ eisa_out8(0x40,0x20); /* OCW2 */ /* slave pic */ eisa_out8(0x11,0xa0); /* ICW1 */ eisa_out8(0x08,0xa1); /* ICW2 */ eisa_out8(0x02,0xa1); /* ICW3 */ eisa_out8(0x01,0xa1); /* ICW4 */ eisa_out8(0x40,0xa0); /* OCW2 */ udelay(100); slave_mask = 0xff; master_mask = 0xfb; eisa_out8(slave_mask, 0xa1); /* OCW1 */ eisa_out8(master_mask, 0x21); /* OCW1 */ /* setup trig level */ EISA_DBG("EISA edge/level %04x\n", eisa_irq_level); eisa_out8(eisa_irq_level&0xff, 0x4d0); /* Set all irq's to edge */ eisa_out8((eisa_irq_level >> 8) & 0xff, 0x4d1); EISA_DBG("pic0 mask %02x\n", eisa_in8(0x21)); EISA_DBG("pic1 mask %02x\n", eisa_in8(0xa1)); EISA_DBG("pic0 edge/level %02x\n", eisa_in8(0x4d0)); EISA_DBG("pic1 edge/level %02x\n", eisa_in8(0x4d1)); spin_unlock_irqrestore(&eisa_irq_lock, flags); }

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/* Device initialisation */ #define is_mongoose(dev) (dev->id.sversion == 0x00076)
static int __init eisa_probe(struct parisc_device *dev) { int i, result; char *name = is_mongoose(dev) ? "Mongoose" : "Wax"; printk(KERN_INFO "%s EISA Adapter found at 0x%08lx\n", name, (unsigned long)dev->hpa.start); eisa_dev.hba.dev = dev; eisa_dev.hba.iommu = ccio_get_iommu(dev); eisa_dev.hba.lmmio_space.name = "EISA"; eisa_dev.hba.lmmio_space.start = F_EXTEND(0xfc000000); eisa_dev.hba.lmmio_space.end = F_EXTEND(0xffbfffff); eisa_dev.hba.lmmio_space.flags = IORESOURCE_MEM; result = ccio_request_resource(dev, &eisa_dev.hba.lmmio_space); if (result < 0) { printk(KERN_ERR "EISA: failed to claim EISA Bus address space!\n"); return result; } eisa_dev.hba.io_space.name = "EISA"; eisa_dev.hba.io_space.start = 0; eisa_dev.hba.io_space.end = 0xffff; eisa_dev.hba.lmmio_space.flags = IORESOURCE_IO; result = request_resource(&ioport_resource, &eisa_dev.hba.io_space); if (result < 0) { printk(KERN_ERR "EISA: failed to claim EISA Bus port space!\n"); return result; } pcibios_register_hba(&eisa_dev.hba); result = request_irq(dev->irq, eisa_irq, IRQF_SHARED, "EISA", &eisa_dev); if (result) { printk(KERN_ERR "EISA: request_irq failed!\n"); return result; } /* Reserve IRQ2 */ setup_irq(2, &irq2_action); for (i = 0; i < 16; i++) { irq_set_chip_and_handler(i, &eisa_interrupt_type, handle_simple_irq); } EISA_bus = 1; if (dev->num_addrs) { /* newer firmware hand out the eeprom address */ eisa_dev.eeprom_addr = dev->addr[0]; } else { /* old firmware, need to figure out the box */ if (is_mongoose(dev)) { eisa_dev.eeprom_addr = SNAKES_EEPROM_BASE_ADDR; } else { eisa_dev.eeprom_addr = MIRAGE_EEPROM_BASE_ADDR; } } eisa_eeprom_addr = ioremap_nocache(eisa_dev.eeprom_addr, HPEE_MAX_LENGTH); result = eisa_enumerator(eisa_dev.eeprom_addr, &eisa_dev.hba.io_space, &eisa_dev.hba.lmmio_space); init_eisa_pic(); if (result >= 0) { /* FIXME : Don't enumerate the bus twice. */ eisa_dev.root.dev = &dev->dev; dev_set_drvdata(&dev->dev, &eisa_dev.root); eisa_dev.root.bus_base_addr = 0; eisa_dev.root.res = &eisa_dev.hba.io_space; eisa_dev.root.slots = result; eisa_dev.root.dma_mask = 0xffffffff; /* wild guess */ if (eisa_root_register (&eisa_dev.root)) { printk(KERN_ERR "EISA: Failed to register EISA root\n"); return -1; } } return 0; }

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matthew wilcoxmatthew wilcox36476.47%531.25%
marc zyngiermarc zyngier9018.91%212.50%
kyle mcmartinkyle mcmartin61.26%16.25%
greg kroah-hartmangreg kroah-hartman51.05%16.25%
alexander beregalovalexander beregalov40.84%16.25%
thomas gleixnerthomas gleixner20.42%212.50%
helge dellerhelge deller20.42%212.50%
yinghai luyinghai lu20.42%16.25%
james bottomleyjames bottomley10.21%16.25%
Total476100.00%16100.00%

static const struct parisc_device_id eisa_tbl[] = { { HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00076 }, /* Mongoose */ { HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00090 }, /* Wax EISA */ { 0, } }; MODULE_DEVICE_TABLE(parisc, eisa_tbl); static struct parisc_driver eisa_driver = { .name = "eisa_ba", .id_table = eisa_tbl, .probe = eisa_probe, };
void __init eisa_init(void) { register_parisc_driver(&eisa_driver); }

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static unsigned int eisa_irq_configured;
void eisa_make_irq_level(int num) { if (eisa_irq_configured& (1<<num)) { printk(KERN_WARNING "IRQ %d polarity configured twice (last to level)\n", num); } eisa_irq_level |= (1<<num); /* set the corresponding bit */ eisa_irq_configured |= (1<<num); /* set the corresponding bit */ }

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void eisa_make_irq_edge(int num) { if (eisa_irq_configured& (1<<num)) { printk(KERN_WARNING "IRQ %d polarity configured twice (last to edge)\n", num); } eisa_irq_level &= ~(1<<num); /* clear the corresponding bit */ eisa_irq_configured |= (1<<num); /* set the corresponding bit */ }

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static int __init eisa_irq_setup(char *str) { char *cur = str; int val; EISA_DBG("IRQ setup\n"); while (cur != NULL) { char *pe; val = (int) simple_strtoul(cur, &pe, 0); if (val > 15 || val < 0) { printk(KERN_ERR "eisa: EISA irq value are 0-15\n"); continue; } if (val == 2) { val = 9; } eisa_make_irq_edge(val); /* clear the corresponding bit */ EISA_DBG("setting IRQ %d to edge-triggered mode\n", val); if ((cur = strchr(cur, ','))) { cur++; } else { break; } } return 1; }

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__setup("eisa_irq_edge=", eisa_irq_setup);

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matthew wilcoxmatthew wilcox182491.89%1035.71%
marc zyngiermarc zyngier974.89%27.14%
thomas gleixnerthomas gleixner321.61%621.43%
kyle mcmartinkyle mcmartin110.55%27.14%
greg kroah-hartmangreg kroah-hartman50.25%13.57%
helge dellerhelge deller50.25%310.71%
alexander beregalovalexander beregalov40.20%13.57%
art haasart haas40.20%13.57%
yinghai luyinghai lu20.10%13.57%
james bottomleyjames bottomley10.05%13.57%
Total1985100.00%28100.00%
Directory: drivers/parisc
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